Device and method for adjusting only unsprung mass of vehicle

The invention relates to a device and method for adjusting only the unsprung mass of a vehicle. The device comprises an axle flange arranged below a cross arm of the vehicle and used for adjusting thestability of a vehicle body, an axle flange driving servo motor fixedly arranged at the cross arm of the vehicle and used for driving the axle flange to rotate, and a tire pressure tire temperature monitoring sensor arranged in the tire of the vehicle and used for detecting the tire pressure and temperature of the vehicle tire; the axle flange driving servo motor is connected with a vehicle ECU through a driving circuit; and the tire pressure tire temperature monitoring sensor is wirelessly matched with the vehicle ECU via a wireless transmission circuit. The method comprises: obtaining the initial tire pressure TP0 when the vehicle is stationary, and monitoring the tire pressure of the tire in real time through the tire pressure tire temperature monitoring sensor, to obtain the tire pressure TP1; and calculating